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Full Discussion: Stop flood - how ?
Special Forums Cybersecurity Stop flood - how ? Post 302449950 by pludi on Wednesday 1st of September 2010 04:25:07 AM
Old 09-01-2010
How exactly are you flooded? Is it an DoS attack using SYN flooding? If so, enable SYN Cookies by running
Code:
# echo 1 > /proc/sys/net/ipv4/tcp_syncookies

Is it a break-in attempt against an application like SSH? Then limit the number of connection attempts by matching against a limit (described here; about half-way down the page, search for "limit") or by allowing only a certain number of recent connections (described here).
 

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URL(4)							   BSD Kernel Interfaces Manual 						    URL(4)

NAME
url -- Realtek RTL8150L USB Ethernet driver SYNOPSIS
url* at uhub? urlphy* at mii? DESCRIPTION
The url driver provides support for USB Ethernet adapters based on the Realtek RTL8150L USB-ether bridge chip. The url driver supports the following adapters: CompUSA USBKR100 GreenHouse GH-USB100B Melco Inc. LUA-KTX Sitecom LN013 For more information on configuring this device, see ifconfig(8). DIAGNOSTICS
url%d: watchdog timeout A packet was queued for transmission and a transmit command was issued, however the device failed to acknowledge the transmission before a timeout expired. url%d: no memory for rx list The driver failed to allocate an mbuf for the receiver ring. SEE ALSO
arp(4), mii(4), netintro(4), usb(4), ifconfig(8) HISTORY
The url device driver first appeared in NetBSD 1.6. AUTHORS
The url driver was written by Shingo WATANABE <nabe@nabechan.org>. BSD
September 18, 2006 BSD
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